<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style></style>
</head>

<body>
    <div id="app">
        <input type="text" name="" id="" @keyup.enter="search" v-model='city'>
        <button>搜索</button>
        <ul>
            <li>北京</li>
            <li>上海</li>
            <li>武汉</li>
        </ul>
    </div>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>

    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="./js/main.js"></script>
</body>

</html>